USN-1974-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1974-1

linux vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 13.04

Summary

Several security issues were fixed in the kernel.

Software description

linux
- Linux kernel

Details

Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel onARM platforms. A local user could exploit this flaw to gain privileges orcause a denial of service (system crash). (CVE-2013-4254)

A memory leak was discovered in the user namespace facility of the Linuxkernel. A local user could cause a denial of service (memory consumption)via the CLONE_NEWUSER unshare call. (CVE-2013-4205)

Update instructions

The problem can be corrected by updating your system to the following
package version:

After a standard system update you need to reboot your computer to makeall the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall all third party kernel modules you might have installed. Ifyou use linux-restricted-modules, you have to update that package aswell to get modules which work with the new kernel version. Unless youmanually uninstalled the standard kernel metapackages (e.g. linux-generic,linux-server, linux-powerpc), a standard system upgrade will automaticallyperform this as well.